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2005-05-31 20:23:05 | Hit : 25162 | Vote : 8642

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[자료] THE EVOLUTION OF REVERSED SEXUAL DIMORPHISM IN OWLS: AN EMPIRICAL ANALYSIS OF POSSIBLE SELECTIVE FACTORS

Wilson Bull., 98(3), 1986, pp. 387-406

THE EVOLUTION OF REVERSED SEXUAL DIMORPHISM IN OWLS: AN EMPIRICAL ANALYSIS OF POSSIBLE SELECTIVE FACTORS

HELMUT C. MUELLER’

ABSTRACT

NO less than 20 hypotheses have been proposed to explain reversed sexual
dimorphism (RSD) in raptorial birds. I have generated a prediction from each of these
hypotheses and tested the prediction using the available information and nonparametric
statistics. RSD correlates significantly only with female dominance in intraspecies interac-
tions and with prey type. Unfortunately, the data on dominance interactions are limited,
but the best working hypothesis appears to be that RSD has evolved primarily as a result
of epigamic selection, with female dominance facilitating pair formation and maintenance.
Prey specialization appears merely to influence the degree of, and does not cause, RSD.
Most species of owls are specialists on either invertebrates or small mammals. Specialists
on invertebrates show little RSD and specialists on small mammals show moderate to high

RSD. Received 22 Feb. 1985, accepted 31 Jan. 1986.

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